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Instruction : Answer the questions given below on the basis following figure.

MN is a transverse common tangent. A and B are centres of the circles whose radii are respectively `r_1 and r_2`. Length of AB is d.
Length of AQ is

A

1. `(r_1 d)/( r_1 - r_2)`

B

2. `( r_2 d)/( r_1 - r_2)`

C

3. `( r_1 d)/( r_1 + r_2)`

D

4. `(r_2 d)/( r_1 + r_2)`

Text Solution

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The correct Answer is:
C
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